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HSXA16 SERIES
High Pressure Switch
HSXA16 units are equipped with a high pressure switch
that is located in the liquid line of the compressor. The
switch (SPST, manual reset, normally closed) removes
power from the compressor when liquid pressure rises
above factory setting at 640 + 10 psi.
Low Pressure Switch
HSXA16 units are also equipped with a low pressure
switch that is located in the vapor line of the compressor.
The switch (SPST, auto−reset, normally closed) removes
power from the compressor when vapor line pressure
drops below factory setting at 40 + 5 psi.
Maintenance
WARNING
Electric shock hazard. Can cause inju-
ry or death. Before attempting to per-
form any service or maintenance, turn
the electrical power to unit OFF at dis-
connect switch(es). Unit may have
multiple power supplies.
Before the start of each heating and cooling season, the
following service checks should be performed by a quali-
fied service technician.
First, turn off electrical power to
the unit prior to performing unit maintenance.
Inspect and clean the outdoor and indoor coils. The
outdoor coil may be flushed with a water hose.
NOTE − It may be necessary to flush the outdoor coil
more frequently if it is exposed to substances which
are corrosive or which block airflow across the coil
(e.g., pet urine, cottonwood seeds, etc.)
Visually inspect the refrigerant lines and coils for leaks.
Check wiring for loose connections.
Check voltage at the indoor and outdoor units (with
units operating).
Check the amperage draw at the outdoor fan motor,
compressor, and indoor blower motor. Values should
be compared with those given on unit nameplate.
Check, clean (or replace) indoor unit filters.
Check the refrigerant charge and gauge the system
pressures.
Check the condensate drain line for free and unob-
structed flow; clean, if necessary.
Adjust blower speed for cooling. Measure the pressure
drop over the coil to determine the correct blower CFM.
Refer to the unit information service manual for pressure
drop tables and procedure.
Check drive belt for wear and proper tension.
NOTE − If owner reports insufficient cooling, the unit
should be gauged and refrigerant charge checked. Re-
fer to section on refrigerant charging in this instruction.
NOTE − Outdoor fan motor is prelubricated and
sealed. No further lubrication is needed.
Optional Accessories
Refer to the Engineering Handbook for optional accesso-
ries that may apply to this unit. The following may or may
not apply:
Loss of charge kit
High pressure switch kit
Compressor monitor
Compressor crankcase heater
Hail guards
Mounting bases
Timed off control
Stand−off kit
Sound cover
Low ambient kit
Monitor Kit
SignatureStat
room thermostat
Homeowner Information − Maintenance
In order to ensure peak performance, your system must be
properly maintained. Clogged filters and blocked airflow
prevent your unit from operating at its most efficient level.
1. Ask your Lennox dealer to show you where your indoor
unit’s filter is located. It will be either at the indoor unit
(installed internal or external to the cabinet) or behind
a return air grille in the wall or ceiling. Check the filter
monthly and clean or replace it as needed.
2. Disposable filters should be replaced with a filter of the
same type and size.
NOTE − If you are unsure about the filter required for
your system, call your Lennox dealer for assistance.
IMPORTANT
Turn off electrical power to the unit at the
disconnect switch before performing any
maintenance. The unit may have multiple power
supplies.
3. Many indoor units are equipped with reusable foam fil-
ters. Clean foam filters with a mild soap and water
solution; rinse thoroughly; allow filter to dry completely
before it is returned to the unit or grille.
NOTE − The filter and all access panels must be in
place any time the unit is in operation.
4. Some systems are equipped with an electronic air
cleaner, designed to remove the majority of airborne
particles from the air passing through the cleaner. If
your system is so equipped, ask your dealer for main-
tenance instructions.
5. Inspect and clean indoor coil. The indoor evaporator
coil is equipped with a drain pan to collect condensate
formed as your system removes humidity from the in-
side air. Have your dealer show you the location of the
drain line and how to check for obstructions. (This
would also apply to an auxiliary drain, if installed.)
